Online Thesis Search Results

TITLE
CERTIFICATE
DECLARATION
ACKNOWLEDGEMENT
GLOSSARY OF TERMS
CONTENTS
Preface
I. Introduction
1.1. Modification of polymers
1.1.1 Physical blends
1.1.2 Chemical blends
Fig.1.1. Structure of graft copolymer
Fig.1.2. Interpenetrating polymer networks: (a) IPN and (b) ) semi-IPN.
Fig.1.3.Representation of various block copol) mer architectures:
1.2. Critical survey of block copolymer TPE
1.2.1 Polyolefin block copolymers
Fig.1.5. Stress-strain properties of elastomers
1.2.2 Polyether-ester block copolymers
1.2.3 Polyurethane block copolymers
1.2.4 Studies on nonpolar soft segment-based block copolymers
1.3. Scope of the present work
1.4. Objectives
1.5. References
2. Experimental
2.1. Materials
2.2. Experimental
2.2.1 Preparation of hydroxyl terminated liquid natural rubber (HTNR) by photodepolymerisation of natural rubber (NR)
2.2.2 Determination of the molecular weight (Mv?) of HTNR
2.2.3 Estimation of hydroxyl value
2.2.4 Estimation of epoxy value
2.3. Synthesis of block copolymers
2.3.1 Synthesis of block copolymers based on HTNR and PEO by solution polymerisation
2.3.2 Synthesis of block copolymers based on HTNR and PPO by solution polymerisation
2.3.3 Synthesis of block copolymers based on HTNR and PTMO by solution polymerisation.
2.4. Hydrogels: swelling studies on block copolymers from HTNR and PEO
2.5. Measurements
2.5.1 Infrared spectral analysis
2.5.2 NMR spectral analysis
2.5.3 Differential scanning calorimetric (DSC) analysis
2.5.4 Thermogravimetric analysis (TGA)
2.5.5 Scanning electron microscopic (SEM) analysis
2.5.6 Optical microscopy
2.5.7 Stress-strain behaviour
2.5.8 Tear strength
2.5.9 Shore A hardness
2.6. References
3. Results and Discussion
3.1. Block copolymers based on HTNR and PEO
Table 3.1. Composition and molecular weight of the components in NR/PEO block copolymers*
3.1.1 Spectral analysis
Fig.3.1. IR spectrum of HTNR-3000
Fig.3.2. H-NMR spectrum of HTNR-3000
Fig.3.3. 13C-NMR spectrum of HTNR-3000
3.1.2 Course of the reaction and structure of the product
3.1.3 DSC studies of the block copolymers
3.1.4 Thermogravimetric analysis (TGA)
3.1.5 Tensile properties of the block copolymers
3.1.5.1 Block copcopolymers based on HTNR- 3000 and PEO
3.1.5.2 Block copolymers based on HTNR-8800 and PEO
3.1.5.3 Block copolymers based on HTNR-l0000 and PEO
3.1.5.4 Block copolymers based on HTNR 17000 and PEO
3.1.5.5 Comparative account of tensile data of two-shot and one-shot products
3.1.5.6 Comparative study of the tensile properties among two-shot products
3.1.6 Tensile fracture mechanism by SEM studies
3.1.6.1 Block copolymers based on HTNR-3000 and PEO
Fig.3.38. SEM fractographs of NR/PE0 (3000/6000) -2
Fig.3.39. SEM fractographs of NR/PE0 (3000/10000) -2
Fig.3.40, SEM fractographs of NR/PE0 (3000/10000) - 1
3.1.6.2 Block copolymer based on HTNR-8800 and PEO
Fig.3.41. SEM fractographs of NR/PE0 (8800/8000) -2
Fig.3.42. SEM fractogaphs of NR/PEO (8800/I0000) -2
Fig.3.43. SEM fractographs of NR/PE0 (8800/10000) -1
3.1.6.3 Block copolymers based on HTNR-17000 and PEO
Fig.3.44. SEM fractographs of NR/PE0 (17000/6000) -2
Fig.3.45. SEM fractographs of NR/PEO (I 7000/10000) -2
Fig.3.46. SEM fractographs of NR/PEO (17000/10000) -1
3.1.6.4 Effect of molecular weight of PEG on the fracture mechanism
3.1.6.5 Effect of molecular weight of HTNR on the fracture mechanism
3.1.6.6 Effect of the method of synthesis on the fracture mechanism
3.1.7 Morphology of the block copolymers
3.1.8 Optical microscopic studies
3.1.8.1 Block copolymers based on HTNR-3000 and PEO
Fig.3.47. Optical micrograph of NR/PE0 (3000/4000) -2
Fig.3.48. Optical micrograph of NR/PE0 (3000/6000) -2
Fig.3.49. Optical micrograph of NR/PE0 (3000/8000) -2
Fig.3.50. Optical micrograph of NR/PEO (3000/10000) -2
3.1.8.2 Block copolymers based on HTNR-8800 and PEO
Fig.3.51. Optical micrograph of NR/PE0 (8800/10000) -2
3.1.8.3 Block copolymers based on HTNR-10000 and PEO
Fig.3.52. Optical micrograph of NR/PE0 (10000/10000) -2
3.1.8.4 Block copolymers based on HTNR-17000 and PEO
Fig.3.54. Optical micrograph of NR/PEO (1 7000/4000) -2
Fig.3.55. Optical micrograph of NR/PEO (17000/6000) -2
Fig.3.56. Optical micrograph of NR/PEO (17000/10000) -2
3.1.9 Tear strength
Fig.3.57. Variation of tear strength with PEO molecular weight
3.1.10 Hardness
3.1.11 Hydrogels
3.2 Block copolymers based on HTNR and PPO
3.2.1 Spectral analysis
3.2.1.1 IR analysis
3.2.1.2 Characterisation of block copolymers by spectral analysis
3.2.1.3 One-shot products
3.2.2 Course of the reaction and structure of the products
3.2.3 Differential scanning calorimetric (DSC) studies
3.2.3.1 Two-shot products
3.2.3.2 One-shot products
3.2.4 Thermogravimetric studies (TGA)
3.2.4.1 Degradation of block copolymers based on HTNR-3000 (two-shot)
3.2.4.2 Degradation of block copolymers based on HTNR-3000 (one-shot)
3.2.4.3 Degradation of block copolymers based on HTNR-8800. HTNR-10000 and HTNR-17000 (two-shot and one-shot)
3.2.4.4 Comparative account of the thermal data from TGA studies of the two-shot products
3.2.4.5 Comparison of the one-shot and two-shot products
3.2.5 Tensile properties of block copolymers based on HTNR and PPO:
3.2.5.1 Block copolymers based on HTNR-3000 and PPO
3.2.5.2 Block copolymers based on HTNR-8800 and PPO
3.2.5.3 Block copolymers based on HTNR-10000 and PPO
3.2.5.4 Block copolymers based on HTNR-17000 and PPO
3.2.5.5 Comparative account of the tensile data of two-shot products
3.2.5.6 Effect of HTNR molecular weight on tensile properties
3.2.5.7 Comparative account of tensile data of two-shot and one-shot products
3.2.6 Fracture mechanism by SEM studies
3.2.7 Morphological studies by SEM
3.2.8 Optical microscopy
3.2.9 Tear strength
3.2.10 Hardness
3.3 Block copolymers based on HTNR and PTMO
3 3.1 Characterisation by spectral analysis
3.3.1.1 Characterisation of PTMO by spectral analysis
3.3.1.2 Characterisation of the block copolymers by spectral analysis
3.3.2 Course of the reaction and structure of the product
3.3.3 DSC studies of the block copolymers
3.3.3.1 Two-shot products
3.3.3.2 One-shot products
3.3.4 Thermogravimetric analysis (TGA)
3.3.4.1 Two-shot products
3.3.4.2 One-shot products
3.3 4.3 Comparative account of the thermal data of the VR / PTMO samples (two-shot)
3.3.4.4 Comparative account of the thermal data of two-shot and one-shot products o f NR / PTMO
3.3.5 Tensile measurements of NR / PTMO block copolymers
3.3.5.1 Block copolymers based on HTNR-3000 and PTMO
3.3.5.2 Block copolymers based on HT-R-8800 and PTMO
3.3.5.3 Block copolymers based on HTNR-10000 and PTMO
3.3.5.4 Block copolymers based on HTNR- 17000 and PTMO
3.3.5.5 Comparative account of the tensile properties of two-shot products
3.3.5.6 Comparative account of two-shot and one-shot products
3.3.6 Tensile fracture mechanism by SEM studies
3.3.6.1 Block copolymers based on HTNR-3000
3.3.6.2 Block copolymers based on HTNR-8800
3.3.6.3 Block copolymers based on HTNR-10000
3.3.6.4 Block copolymers hared on HTNR-17000
3.3.6.5 Effect of varying the molecular weight of polyether on fracture mechanism
3.3.6.6 Effect of variation in the molecular weight of HTNR on fracture mechanism
3.3.7 Morphology by SEM studies
3.3.7.1 Block copolymers based on HTAR-3000
3.3.7.2 Block copolymers based on HTNR-8800
3.3. 7.3 Block copolymers based on HTNR-10000
3.3.7.4 Block copolymers based on HTNR-17000
3.3.7.5Effect of varying the molecular weight of PTMO on the morphology
3.3.7.6 Effect of varying the molecular weight of HTNR on the morphology
3.3.8 Optical microscopic studies
3.3.9 Tear strength
3.3.10 Hardness
3.4 A comprehensive review of the NR / polyether block copolymers.
3.4.1 Synthesis of the block copolymers Differential scanning calorimetry (DSC) studies
3.4.2 Differential scanning calorimetry (DSC) studies
3.4.3 Thermogravimetric (TGA) studies
3.4.4 Tensile properties
3.4.4.1 NR / PEO block copolymers
3.4.4.2 NR / PTMO block copolymers
3.4.4.3 NR PPO block copolymers
3.4.4.4 Yield behaviour
3.4.4.5 Variation of tensile properties with HTNR molecular weight
3.4.5 Tensile fracture mechanism
3.4.5.1 NR / PEO block copolymers
3.4.5.2 NR / PTMO block copolymers
3.4.5.3 NR / PPO block copolymers
3.4.6 Morphology of the block copolymers
3.4.6.1 NR / PEO block copolymers
3.4.6.2 NR / PTMO block copolymers
3.4.6.3 NR / PPO block copolymers
3.4.7 Tear strength
3.4.8 Hardness
3.4.9 Swelling studies of NR / PEO
3.5. References
4. Conclusion
APPENDIX
1. Scope for further work
2. List of Publications